Website Responsive Calculator

* Overview:
+ Help Web designer, Front-end developer calculate the percentage of child element to parent element.
+ Do website responsive: we should calculate the percentage of each element in website ( response to Mobile, Desktop, Tablet) with many screens.

* Features:
+ User can input width of child element and parent element.
+ Result will be auto updated when user input data to Input fields.

* How to use?
+ Input width of your child element (in pixel)
+ Input width of your parent element (in pixel)
+ The result will be at the bottom. (in %)